19929629 has 4 divisors (see below), whose sum is σ = 20210400. Its totient is φ = 19648860.

The previous prime is 19929617. The next prime is 19929647. The reversal of 19929629 is 92692991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19929629 is a prime.

It is a super-2 number, since 2×19929629² = 794380224155282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19929929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140279 + ... + 140420.

It is an arithmetic number, because the mean of its divisors is an integer number (5052600).

Almost surely, 2^19929629 is an apocalyptic number.

It is an amenable number.

19929629 is a deficient number, since it is larger than the sum of its proper divisors (280771).

19929629 is an equidigital number, since it uses as much as digits as its factorization.

19929629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280770.

The product of its digits is 157464, while the sum is 47.

The square root of 19929629 is about 4464.2613050761. The cubic root of 19929629 is about 271.1230270687.

The spelling of 19929629 in words is "nineteen million, nine hundred twenty-nine thousand, six hundred twenty-nine".